Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands
International audience Frozen islands in the Lena River, Siberia, experience rates of fluvial thermal erosion exceeding 10m/year. The islands erode differentially, with rates of frontal retreat exceeding those on island sides. We define the erosion ratio (ER) between the front and sides to estimate...
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ftunivparis1:oai:HAL:hal-01894585v1 2024-05-19T07:43:41+00:00 Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands Dupeyrat, Laure Hurault, Benoît Costard, F. Marmo, Chiara Gautier, Emmanuèle Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) 2018-04 https://hal.science/hal-01894585 https://doi.org/10.1002/ppp.1973 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.1973 hal-01894585 https://hal.science/hal-01894585 doi:10.1002/ppp.1973 ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-01894585 Permafrost and Periglacial Processes, 2018, 29 (2), pp.100 - 111. ⟨10.1002/ppp.1973⟩ [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2018 ftunivparis1 https://doi.org/10.1002/ppp.1973 2024-05-01T23:52:23Z International audience Frozen islands in the Lena River, Siberia, experience rates of fluvial thermal erosion exceeding 10m/year. The islands erode differentially, with rates of frontal retreat exceeding those on island sides. We define the erosion ratio (ER) between the front and sides to estimate this differential erosion. A GIS‐based study of 19 islands from 1967 to 2010 indicated average erosion rates of 19.7 and 3.7 m/year for the island heads and sides, respectively. The average ER over the period was 4.7. An analytical model of local thermal erosion for a frozen cylinder of sand in a turbulent water flow is proposed, assuming an ablation process. Thermal erosion of 19 frozen cylinders was measured for water flows of different temperature and velocity in a cold chamber. As observed in the field, frontal erosion always exceeded lateral erosion, with an average ER of 1.6. The ER decreased with increasing temperature from 5 to 15°C. The higher value of ER in the field may be due to interactions with neighboring islands and banks. An empirical law including phase change and the process of erosion is proposed, and validates our model compared with previous laws that do not account for erosion. The erosion process enhances heat transfer. Article in Journal/Newspaper lena river Permafrost and Periglacial Processes Siberia Université Paris 1 Panthéon-Sorbonne: HAL Permafrost and Periglacial Processes 29 2 100 111 |
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Open Polar |
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Université Paris 1 Panthéon-Sorbonne: HAL |
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ftunivparis1 |
language |
English |
topic |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences Dupeyrat, Laure Hurault, Benoît Costard, F. Marmo, Chiara Gautier, Emmanuèle Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
topic_facet |
[SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Frozen islands in the Lena River, Siberia, experience rates of fluvial thermal erosion exceeding 10m/year. The islands erode differentially, with rates of frontal retreat exceeding those on island sides. We define the erosion ratio (ER) between the front and sides to estimate this differential erosion. A GIS‐based study of 19 islands from 1967 to 2010 indicated average erosion rates of 19.7 and 3.7 m/year for the island heads and sides, respectively. The average ER over the period was 4.7. An analytical model of local thermal erosion for a frozen cylinder of sand in a turbulent water flow is proposed, assuming an ablation process. Thermal erosion of 19 frozen cylinders was measured for water flows of different temperature and velocity in a cold chamber. As observed in the field, frontal erosion always exceeded lateral erosion, with an average ER of 1.6. The ER decreased with increasing temperature from 5 to 15°C. The higher value of ER in the field may be due to interactions with neighboring islands and banks. An empirical law including phase change and the process of erosion is proposed, and validates our model compared with previous laws that do not account for erosion. The erosion process enhances heat transfer. |
author2 |
Géosciences Paris Sud (GEOPS) Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS) Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) Université Paris 1 Panthéon-Sorbonne (UP1)-Université Paris-Est Créteil Val-de-Marne - Paris 12 (UPEC UP12)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Dupeyrat, Laure Hurault, Benoît Costard, F. Marmo, Chiara Gautier, Emmanuèle |
author_facet |
Dupeyrat, Laure Hurault, Benoît Costard, F. Marmo, Chiara Gautier, Emmanuèle |
author_sort |
Dupeyrat, Laure |
title |
Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
title_short |
Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
title_full |
Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
title_fullStr |
Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
title_full_unstemmed |
Satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
title_sort |
satellite image analysis and frozen cylinder experiments on thermal erosion of periglacial fluvial islands |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01894585 https://doi.org/10.1002/ppp.1973 |
genre |
lena river Permafrost and Periglacial Processes Siberia |
genre_facet |
lena river Permafrost and Periglacial Processes Siberia |
op_source |
ISSN: 1045-6740 EISSN: 1099-1530 Permafrost and Periglacial Processes https://hal.science/hal-01894585 Permafrost and Periglacial Processes, 2018, 29 (2), pp.100 - 111. ⟨10.1002/ppp.1973⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/ppp.1973 hal-01894585 https://hal.science/hal-01894585 doi:10.1002/ppp.1973 |
op_doi |
https://doi.org/10.1002/ppp.1973 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
29 |
container_issue |
2 |
container_start_page |
100 |
op_container_end_page |
111 |
_version_ |
1799483424509001728 |